ATTO Technology 2700C Benutzerhandbuch

28

Troubleshooting

Cat5E and Cat6 cable are the best cabling for 
the iPBridge.

2

Verify the IP address, subnet mask, and 
gateway are properly set on each data port on 
the iPBridge for your network environment. 
Refer to 

3

Verify that the Ethernet speed is set to auto: 
check the 

Ethernet page of the ATTO 

ExpressNAV interface, or check the LED link 
lights to determine if the Ethernet speed is 
correct. Refer to 

4

Determine if the iPBridge is set to get its IP 
information from a DHCP server. If so, verify 
that the DHCP server has available IP 
addresses. Refer to 

5

Verify that each used Ethernet port on the 
iPBridge can be pinged from the desired host. 
Refer to 

If the host cannot ping the iPBridge ports and 
the iPBridge ports are properly configured, 
continue to the Local Area Network/Wide Area 
Network section, 

page 28.
Verify that each port on the iPBridge can ping 
each desired host. Refer to 

the iPBridge cannot ping the host, continue to 

 on page 28.

6

If using DHCP (the default), verify that the 
DHCP server is assigning the correct IP 
information to the host.

7

Verify VLAN IDs are either disabled or are set 
up identically on the iPBridge and the 
connecting switch.

8

Some older switches/hosts cannot auto 
negotiate between the iPBridge and the 
switch/host at the desired speed. You may 
have to force the host/switch or the iPBridge to 
the desired speed.

9

Verify that the host is logging into the iPBridge 
correctly by viewing the

 Connections page 

and determining if there a “session open” 
status.

10 Verify that you are using the correct login 

procedure for your initiator. For example: When 
connecting using the Adaptec initiator, the log 
on screen requests the iPBridge iqn (iSCSI 
qualified name). If left blank, Adaptec will not be 

able to log in. Enter “iSCSI” into this field for 
auto iqn discovery.

When changing any setting on the iPBridge, the 
configuration must be saved by clicking on the Save 
button on the ATTO ExpressNAV interface screen or 
using the saveConfiguration CLI command.

1

Verify that the switch/switches are segmented 
properly so that hosts and the iPBridge have 
access to each other.

2

If there are routers involved in the setup, make 
sure the IP addresses and/or MAC addresses 
of the iPBridge are allowed through the router.

3

Verify that the switch can see the iPBridge on 
the port(s) in question. Refer to your switch 
vendor’s guide for more information.

iSCSI host adapters appear as a type of Storage 
Controller to the host OS, not as a standard NIC. These 
adapters usually have hardware acceleration to offload 
the TCP processing from the host. Configuration of 
these adapters is usually done through the vendor’s 
own utility and not through the OS itself.   
NICs come in two types: accelerated and un-
accelerated. Accelerated NICs use some hardware to 
offload some of the TCP processing from the host. Un-
accelerated NICs make the OS do all TCP processing.
To check the iSCSI host adapter or NIC

1

Check cable integrity. Check the cables for 
solid connections. Make sure they are plugged 
in properly. Inspect cable ends for broken clips 
and improper wiring.

2

Verify that the iSCSI host adapter or NIC is 
configured with the correct IP information.

3

If using DHCP, verify that the DHCP server is 
assigning the correct IP information to the host.

4

Verify that the hosts are running the 
recommended driver and firmware level for the 
iSCSI host adapter or NIC vendor.

5

Verify that the hosts and the iPBridge are using 
the same port number to communicate iSCSI. 
check the ATTO ExpressNAV iSCSI page. The 
default port number for the iPBridge is 3260. 

6

Make sure the host adapter/NIC is configured 
to log into the iPBridge. Some iSCSI host 
adapters do not re-login upon reboot or 
unplug/replug event without marking a check 
box.